/**
 *    Copyright 2009-2021 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.domain.jpetstore;

import java.io.Serializable;
import java.math.BigDecimal;
import java.util.*;

public class Cart implements Serializable {

    private static final long serialVersionUID = 1L;

    private final Map<String, CartItem> itemMap =
            Collections.synchronizedMap(new HashMap<String, CartItem>());
    private final List<CartItem> itemList = new ArrayList<CartItem>();

    public Iterator<CartItem> getCartItems() {
        return itemList.iterator();
    }

    public List<CartItem> getCartItemList() {
        return itemList;
    }

    public int getNumberOfItems() {
        return itemList.size();
    }

    public boolean containsItemId(String itemId) {
        return itemMap.containsKey(itemId);
    }

    public void addItem(Item item, boolean isInStock) {
        CartItem cartItem = (CartItem) itemMap.get(item.getItemId());
        if (cartItem == null) {
            cartItem = new CartItem();
            cartItem.setItem(item);
            cartItem.setQuantity(0);
            cartItem.setInStock(isInStock);
            itemMap.put(item.getItemId(), cartItem);
            itemList.add(cartItem);
        }
        cartItem.incrementQuantity();
    }


    public Item removeItemById(String itemId) {
        CartItem cartItem = (CartItem) itemMap.remove(itemId);
        if (cartItem == null) {
            return null;
        } else {
            itemList.remove(cartItem);
            return cartItem.getItem();
        }
    }

    public void incrementQuantityByItemId(String itemId) {
        CartItem cartItem = (CartItem) itemMap.get(itemId);
        cartItem.incrementQuantity();
    }

    public void setQuantityByItemId(String itemId, int quantity) {
        CartItem cartItem = (CartItem) itemMap.get(itemId);
        cartItem.setQuantity(quantity);
    }

    public BigDecimal getSubTotal() {
        BigDecimal subTotal = new BigDecimal("0");
        Iterator<CartItem> items = getCartItems();
        while (items.hasNext()) {
            CartItem cartItem = (CartItem) items.next();
            Item item = cartItem.getItem();
            BigDecimal listPrice = item.getListPrice();
            BigDecimal quantity = new BigDecimal(String.valueOf(cartItem.getQuantity()));
            subTotal = subTotal.add(listPrice.multiply(quantity));
        }
        return subTotal;
    }

}
